Series offset rotary printing press



May 19, 1959 P. DIETRICH SERIES OFFSET ROTARY PRINTING PRESS Filed Feb.8, 1955 Unite hrates SERIES OFFSET ROTARY PRINTING PRESS Paul Dietrich,Augsburg, Germany, assignor to Maschinenfabrik Augsburg-Nurnberg A.G.,Augsburg, Germany, a corporation of Germany Application February 8,1955, Serial No. 486,930

Claims priority, application Germany February 13, 1954 3 Claims. (Cl.101-177) This invention relates to a series ofiset printing press. Inparticular the invention is directed to the construction of eachindividual printing stand so that a number of stands can be simply andeffectively connected in series to make a multi-color offset rotaryprinting machine of any length.

Heretofore in series connected press stands, especially in photogravureprinting presses, special drying drums were placed between theindividual press stands. This resulted in a complicated constructionwhich took up considerable floor space.

The object of the instant invention is to rearrange the printing rollsin each press stand, and to eliminate the conventional drying drums sothat a more simplified printing press requiring less floor space can beobtained.

Each press stand includes a plate roll, an offset roll, and a printingroll, together with the conventional inking mechanism. The printing rollis heated and is twice the diameter of the offset roll. The printingroll is mounted above the offset roll, beneath which is mounted a plateroll and inking rolls. This construction makes it possible to run theprinting paper from the top of one press stand to the next stand. Ifprinting on both sides of the paper is desired, conventional reversingrods can be mounted above the press stands.

The means by which the object of the invention is obtained is describedmore fully with reference to the accompanying drawing, which shows adiagrammatic side elevational view of a printing press.

Press stands 1, 2, and 3 are connected in series. Each stand has aprinting roll 4 mounted almost vertically above offset roll 5, thediameter of the printing roll being twice as large as offset roll 5.Beneath roll 5 is the plate roll 6, and the associated inking rolls.Printing roll 4 is internal heated by hot water and external partiallyenclosed by a drying hood 7, which receives hot air from a blower 8driven by a motor 9. As the printing paper is fed to roll 4substantially vertically beneath the axis of the roll, and is removedfrom the roll adjacent the bottom of the roll, the drying hood 7 extendsover the top of the roll and around more than onehalf the circumferenceof the roll. This results in a more complete drying of the paper beforeit leaves the roll. Inasmuch as printing roll 4 is mounted in the upperportion of the press stand, the printing paper is removed from the upperportion of t e stand, and does not interfere with the inking rolls.

If printing on both sides of the paper is desired, conventional typereversing rods 10 can be mounted above the press stands. As shown, theserods 10 are arranged between stands 1 and 2, and, accordingly, atwo-color print can be obtained in the passing of the paper through thetwo stands. It is apparent that the reversing rods 10 can be also placedbetween stands 2 and 3 so that two colors can be obtained on one sideand one color on the other side of the paper. Numerous variations can beachieved by various combinations of the number of press stands and thenumber of reversing rods used. Otherwise the printing press onlyrequires the conventional printing machinery such as the device 11 forfeeding the paper to the press stand, and the device 12 for receivingand folding the printed sheets.

The invention has the advantage that each press stand is simple andcompact, and no intermediate drying drums are needed between theindividual press stands. The inking rolls are readily accessible,inasmuch as they are not obstructed by the paper. Finally, this seriesoiiset rotary printing press is much cheaper to produce and easier toassemble than prior known presses.

Having now described the means by which the objects of the invention areobtained, I claim:

1. An offset printing press having a plurality of series joined printingstands, each printing stand comprising a plate roll and associatedinking rolls, an offset roll above said plate roll, a printing roll ofabout twice the diameter of said plate roll mounted almost verticallyabove said offset roll, means for feeding printing paper to the bottomof the printing roll and for removing the printing paper adjacent thebottom of the printing roll after traveling around the major portion ofthe circumference of the printing roll, means for interiorly heatingsaid printing roll, and ink drying hood means mounted above andextending around a major portion of the circumference of said printingroll.

2. An offset printing press as in claim 1, further comprising guidemeans for transferring the printing paper from one printing cylinder ina path above that printing cylinder and then to an adjacent printingcylinder.

3. An oiiset printing press as in claim 2, further comprising printingpaper reversing rod means mounted above and between adjacent printingrolls.

References Cited in the file of this patent UNITED STATES PATENTS1,133,922 Brila Mar. 30, 1915 1,600,487 Roehlen Sept. 21, 1921 1,709,967Ballou Apr. 23, 1929 1,966,287 Fischer July 10, 1934 2,024,813 BarberDec. 17, 1935 2,088,681 Zuckertnan Aug. 3, 1937 2,242,995 Ericksson May20, 1941 2,308,117 Snyder Jan. 12, 1943 2,768,576 Dietrich Oct. 30, 1956FOREIGN PATENTS 300,613 Switzerland Aug. 15, 1954

